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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a91bfbde2ff2b17b5957c040d2fba4217f856c2eb2051a9424168823b202e8' 
  AND token = 'IA2EendDcfJuVKThLwVw3W5afkhlL8mVa8HUtCfGhYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}